It is important to note that the amount of urease and DODAB
incorporated in LB films could be estimated using the quartz
crystal microbalance technique through the Sauerbrey equation.
The surface density estimated for urease in the LB film
was 498±9 ng/cm2, while that for EPS was 544±6 ng/cm2. These
values are compatible with the monomolecular dimensions, suggesting
a regular deposition as an LB film.